Question 1

Which of the following statements about matter-antimatter engines is not true?

Accepted Answer

A) Matter-antimatter reactions represent the most efficient reactions possible in terms of energy release. 
B) Matter-antimatter engines would be great in theory,but to date we have no evidence that antimatter even exists. 
C) One of the major challenges to developing matter-antimatter engines is finding a way to produce enough antimatter. 
D) One of the major challenges to developing matter-antimatter engines is finding a way to store antimatter after it is produced. 
E) Spacecraft powered by matter-antimatter engines could probably reach speeds of more than half the speed of light. 
A) Matter-antimatter reactions represent the most efficient reactions possible in terms of energy release. 
B) Matter-antimatter engines would be great in theory,but to date we have no evidence that antimatter even exists. 
C) One of the major challenges to developing matter-antimatter engines is finding a way to produce enough antimatter. 
D) One of the major challenges to developing matter-antimatter engines is finding a way to store antimatter after it is produced. 
E) Spacecraft powered by matter-antimatter engines could probably reach speeds of more than half the speed of light.

Question 2

Why is Europa considered a good candidate for the possible existence of life?

Accepted Answer

A) Strong evidence suggests that it has a deep,subsurface ocean of liquid water. 
B) The Galileo spacecraft found strange seasonal changes on its surface that look like they could be due to life. 
C) It is located within our Sun's habitable zone. 
D) It has a thick atmosphere with a surface pressure greater than that on Earth. 
A) Strong evidence suggests that it has a deep,subsurface ocean of liquid water. 
B) The Galileo spacecraft found strange seasonal changes on its surface that look like they could be due to life. 
C) It is located within our Sun's habitable zone. 
D) It has a thick atmosphere with a surface pressure greater than that on Earth.

Question 3

What was the Cambrian explosion?

Accepted Answer

A) the impact of the meteor that led to mass extinction of the dinosaurs 
B) the initial spark of lightning that created the first life-form from amino acids 
C) the eruption of the volcano known as Cambria on the ancient supercontinent of Pangaea 
D) a dramatic diversification of life that began about 540 million years ago 
E) the largest mass extinction in Earth's history 
A) the impact of the meteor that led to mass extinction of the dinosaurs 
B) the initial spark of lightning that created the first life-form from amino acids 
C) the eruption of the volcano known as Cambria on the ancient supercontinent of Pangaea 
D) a dramatic diversification of life that began about 540 million years ago 
E) the largest mass extinction in Earth's history

Question 4

The earliest evidence for life on Earth dates to

Accepted Answer

A) about 4.5 billion years ago. 
B) about 3.8 billion years ago. 
C) about 2 billion years ago. 
D) about 570 million years ago. 
E) about 65 million years ago. 
A) about 4.5 billion years ago. 
B) about 3.8 billion years ago. 
C) about 2 billion years ago. 
D) about 570 million years ago. 
E) about 65 million years ago.

Question 5

If we detected an Earth-like planet in the habitable zone around another star,describe how we might learn whether it contained life.

Accepted Answer

Future technology (large space-based int

Question 6

In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow),what do we mean by fnow?

Accepted Answer

A) the fraction of planets in the galaxy on which a civilization could theoretically develop right now 
B) the fraction of planets with civilizations at the present time (as opposed to only in the past or future) 
C) the fraction of civilizations in the universe that currently are sending messages to us 
D) the fraction of all species ever to exist that we currently are aware of 
A) the fraction of planets in the galaxy on which a civilization could theoretically develop right now 
B) the fraction of planets with civilizations at the present time (as opposed to only in the past or future) 
C) the fraction of civilizations in the universe that currently are sending messages to us 
D) the fraction of all species ever to exist that we currently are aware of

Question 7

What is a mutation?

Accepted Answer

A) a change in an organism that turns it into a different species 
B) a change in the type of food an organism consumes 
C) a change in a living cell's DNA 
D) a change in the physical appearance of a living organism 
A) a change in an organism that turns it into a different species 
B) a change in the type of food an organism consumes 
C) a change in a living cell's DNA 
D) a change in the physical appearance of a living organism

Question 8

If there are other civilizations at present in the Milky Way Galaxy,which statement is almost undoubtedly true?

Accepted Answer

A) They are far more technologically advanced than we are. 
B) They are anatomically much like us,with two arms,two legs,two eyes,and two ears. 
C) They have social structures that are completely different from our own;for example,different types of "family" units,and so on. 
D) For fun,they enjoy "buzzing" to Earth and temporarily abducting people,showing a clear preference for people located in less-developed rural areas. 
A) They are far more technologically advanced than we are. 
B) They are anatomically much like us,with two arms,two legs,two eyes,and two ears. 
C) They have social structures that are completely different from our own;for example,different types of "family" units,and so on. 
D) For fun,they enjoy "buzzing" to Earth and temporarily abducting people,showing a clear preference for people located in less-developed rural areas.

Which of the following statements about matter-antimatter engines is not true?

Why is Europa considered a good candidate for the possible existence of life?

What was the Cambrian explosion?

The earliest evidence for life on Earth dates to

If we detected an Earth-like planet in the habitable zone around another star,describe how we might learn whether it contained life.

In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow),what do we mean by fnow?

What is a mutation?

If there are other civilizations at present in the Milky Way Galaxy,which statement is almost undoubtedly true?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light and Matter: Reading Messages from the Cosmos

Telescopes: Portals of Discovery

Our Planetary System

Formation of the Solar System

Planetary Geology: Earth and the Other Terrestrial Worlds

Planetary Atmospheres: Earth and the Other Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: The New Science of Distant Worlds

Our Star

Surveying the Stars

Star Birth

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundations of Modern Cosmology

Galaxy Evolution

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Celestial Timekeeping and Navigation

Space and Time

Spacetime and Gravity

Building Blocks of the Universe

Filters

Exam 24: Life in the Universe

Which of the following statements about matter-antimatter engines is not true?

Why is Europa considered a good candidate for the possible existence of life?

What was the Cambrian explosion?

The earliest evidence for life on Earth dates to

If we detected an Earth-like planet in the habitable zone around another star,describe how we might learn whether it contained life.

In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow),what do we mean by fnow?

What is a mutation?

If there are other civilizations at present in the Milky Way Galaxy,which statement is almost undoubtedly true?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light and Matter: Reading Messages from the Cosmos

Telescopes: Portals of Discovery

Our Planetary System

Formation of the Solar System

Planetary Geology: Earth and the Other Terrestrial Worlds

Planetary Atmospheres: Earth and the Other Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: The New Science of Distant Worlds

Our Star

Surveying the Stars

Star Birth

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundations of Modern Cosmology

Galaxy Evolution

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Celestial Timekeeping and Navigation

Space and Time

Spacetime and Gravity

Building Blocks of the Universe

Filters